Thanks for your answer, Ronald. Maybe you're right in this is too much a hack. The intention for this: I was thinking what happends if I extend Task and in a later release the same attribute name is introduced officially. That would need a lot of changing in your project if you desired updating to the new release. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4259511#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...